Floyd Mayweather Jr. announced he would be coming out of retirement to compete on New Year's Eve against a 20-year-old kickboxing phenom named Tenshin Nasukawa at RIZIN 14.

SAITAMA, JAPAN - DECEMBER 31: Tenshin Nasukawa of Japan celebrates his KO victory against Yuta Cat Hamamoto of Japan in the kickboxing bout during the RIZIN Fighting World Grand-Prix 2017 final Round at Saitama Super Arena on December 31, 2017 in Saitama, Japan. (Photo by Etsuo Hara/Getty Images)

We don't know just yet what the rules will be for this bout, but most expect it to be a boxing match. If there are any variations to the rule set, it might only come in glove size.

Many were shocked when they heard the announcement, and most who only frequent boxing and MMA circles probably weren't familiar with Tenshin–that includes one of Mayweather's former foes and former two-division UFC champion Conor McGregor. The Notorious One had a predictably crude and racist reaction to the announcement of the fight, but Tenshin showed class and heart with his response.

So we know he can handle himself on social media, but what about his fighting credentials and appeal? Let's take a closer look.

He's Undefeated as a Kickboxer, Mixed Martial Artist, And Charismatic

He's got a ways to go before he reaches Mayweather's 50-0 mark, but Nasukawa is on the right track. As a professional kickboxer, he has amassed a 27-0 record, and he's not even 21 yet. Clearly, he hasn't faced a striker on par with Mayweather, but he did just defeat former standout UFC flyweight Kyoji Horiguchi in his last fight.

His physical skills are legitimate.

Perhaps above his skills, which we'll dissect and highlight in a second, Tenshin is young, charismatic and popular in his country. Some have called him Japan's best combat sports prospect. One look at his highlights and the untrained eye could become overly optimistic about his chances against Mayweather.

The more you look at Tenshin and this matchup, it becomes more clear that he's the perfect choice for Mayweather at this point.

Best Attributes

From watching the 5-7 fights of his that I could find on social media, it's clear that Tenshin's speed and accuracy are his best attributes. His kicks are more blisteringly fast than the punches, but since those probably won't be allowed, it's a moot point. However, he does show considerable hand speed with shots to the head and body.

He's also adept at placing punches where he wants them during exchanges. His aggression and unpredictable attacks overwhelm most of his opponents, and he fights as if he's double parked. Tenshin looks for the finish, but that might not be the best plan of attack against Mayweather.

Biggest Weaknesses

Size and stamina will likely be Tenshin's biggest obstacles to overcome. That's, even more, the case because he will be the smaller man in the ring. Tenshin stands just 5'4" compared to Mayweather at 5'8", and he's slight of build. Mayweather is much stronger than he's given credit for and tough to handle on the inside. His massive edge in experience will be most visible in close quarters where he can turn Tenshin and neutralize the young fighter's speed. Mayweather normally fights from a distance, but his biggest advantage in this one is in close. That's likely where he'll look to keep this fight.

Length and timing have long been major qualities for Mayweather. Past opponents like Juan Manuel Marquez have talked about Mayweather's reach and how it gave them problems. Giving up a solid four inches to Mayweather and who knows how much in reach could be a major problem for Tenshin.

In any case, this is an interesting matchup, but you have to remember Mayweather only takes calculated risks–especially at this stage of his career. If he's taking this bout, he and his team already have a good idea of how to approach it and emerge victoriously.